1 files changed, 24 insertions, 0 deletions
diff --git a/gcc/testsuite/g++.dg/warn/Wunused-parm-4.C b/gcc/testsuite/g++.dg/warn/Wunused-parm-4.C
new file mode 100644
index 000000000..fbad380f6
--- /dev/null
+++ b/gcc/testsuite/g++.dg/warn/Wunused-parm-4.C
@@ -0,0 +1,24 @@
+// PR c++/47783
+// { dg-do compile }
+// { dg-options "-Wunused -W" }
+
+struct R
+{
+  int &i;
+};
+
+void
+foo (R r, int &s)
+{
+  r.i = 7;
+  s = 8;
+}
+
+int
+bar ()
+{
+  int x = 1, y = 1;
+  R r = { x };
+  foo (r, y);
+  return x + y;
+}